// Copyright (C) 2020 Alexey Shvayka. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.

/*---
esid: sec-proxy-object-internal-methods-and-internal-slots-isextensible
description: >
  If "isExtensible" trap is null or undefined, [[IsExtensible]] call is
  properly forwarded to [[ProxyTarget]] (which is also a Proxy object).
info: |
  [[IsExtensible]] ( )

  [...]
  4. Let target be O.[[ProxyTarget]].
  5. Let trap be ? GetMethod(handler, "isExtensible").
  6. If trap is undefined, then
    a. Return ? IsExtensible(target).

  IsExtensible ( O )

  1. Assert: Type(O) is Object.
  2. Return ? O.[[IsExtensible]]().

  [[IsExtensible]] ( )

  [...]
  7. Let booleanTrapResult be ! ToBoolean(? Call(trap, handler, « target »)).
  [...]
  10. Return booleanTrapResult.
features: [Proxy]
---*/

function Test() {
    var array = [];
    var arrayExtensible = true;
    var arrayTarget = new Proxy(array, {
      isExtensible: function() {
        return arrayExtensible;
      },
    });

    var arrayProxy = new Proxy(arrayTarget, {
      isExtensible: undefined,
    });

    assert(Object.isExtensible(arrayProxy));

    Object.preventExtensions(array);
    arrayExtensible = false;

    assert(!Object.isExtensible(arrayProxy));
}

// preheat
const NUMBER_OF_PREHEAT = 1;
for (let i = 0; i < NUMBER_OF_PREHEAT; i++) {
    Test();
}

ArkTools.jitCompileAsync(Test);
assert.sameValue(ArkTools.waitJitCompileFinish(Test), true, '[JIT] JIT disabled.');

// test
const NUMBER_OF_TEST = 1; // or 2
for (let i = 0; i < NUMBER_OF_PREHEAT; i++) {
    Test();
}
